Bigtop_reqs {fruclimadapt}

Chill and heat requirements for Big Top nectarine

Description

Chill and forcing heat requirements for the phenological stages between 'bud swelling' (B, 51 in Baggliolini and BBCH scales, respectively) and 'ovary surrounded by dying sepal crown' (I, 72) in Big Top nectarine. For use in combination with the example dataset Tudela_DW.

Usage

data("Bigtop_reqs")

Format

A data frame with 7 observations on the following 2 variables.

Creq

a numeric vector, chill portions

Freq

a numeric vector, forcing heat as growing degree hours

Details

Chill requirements are in chill portions, starting chill accummulation on 1 november (day of year 305), forcing heat is as growing degree hours calculated with linear method with a base temperature of 4.7 C and no optimal and upper critical thresholds.

Source

Miranda C, Santesteban LG and Royo JB. 2013. Evaluation and fitting of models for determining peach phenological stages at a regional scale. Agric Forest Meteorol 178-179: 129-139.